Is 5G Dangerous to Human Health? What the Science Really Says About the Radiation Fears
In April 2020, in the middle of the deadliest pandemic in a century, firefighters in Belfast, Birmingham, Liverpool and the small English village of Melling were called out to blazes that made no sense. People had set fire to mobile phone masts. Some of the attackers filmed themselves, narrating their motives to camera. They believed the towers were killing people — that 5G networks were either spreading the coronavirus or weakening human bodies so the virus could finish the job.
One of the burned masts, owned by BT in Birmingham, did not even carry 5G. It provided 2G, 3G and 4G service to thousands of people. Another attack targeted a mast serving connectivity to the NHS Nightingale hospital in Birmingham, a facility treating victims of the very virus the arsonists claimed the towers were causing. NHS England’s national medical director, Stephen Powis, called the whole story “complete and utter rubbish.”
The coronavirus version of the claim collapsed almost immediately — viruses, as the WHO pointed out, cannot travel on radio waves, and COVID-19 raged through countries with no 5G networks at all. But the broader claim underneath it survived. Stripped of its pandemic variant, it goes like this: 5G is a new kind of radiation, more dangerous than anything before it, and it is quietly damaging human health — causing cancer, infertility, headaches, immune damage, and who knows what else. It circulates on social media, in YouTube documentaries, in petitions demanding moratoriums on new masts. It is one of the most persistent health fears of the wireless age.
So what does the science actually say? We went through the World Health Organization’s evidence reviews, the international exposure guidelines, the large-scale epidemiological studies, and the actual measurements taken next to 5G towers. The gap between what the instruments record and what the viral posts claim is enormous.
What 5G actually is, and what it is not
The fear starts with a word: radiation. It sounds menacing, but it is worth being precise, because the physics matters enormously to the health question. Not all radiation is the same. Ionizing radiation — X-rays, gamma rays, the radiation from nuclear material — carries enough energy to knock electrons off atoms and damage DNA directly. That is why it can cause cancer.
5G uses radiofrequency electromagnetic fields — radio waves. These are non-ionizing: their photons carry far too little energy to damage DNA directly. The parts of the body nearest to a phone’s antenna can absorb this energy as heat, and excessive heating is a real hazard — it is the reason exposure limits exist. But the idea that a phone call can damage your cells the way an X-ray can has no basis in the physics. 5G is, in this respect, the same kind of radiation as 4G, 3G, Wi-Fi, FM radio and the baby monitor on your shelf. It operates at different frequencies, and in some deployments at higher ones, but it sits on the same non-ionizing side of the spectrum.
This is not a technicality. It is the central fact that the viral claims skip over. When someone says 5G will “fry your brain” or mutate your cells, they are describing ionizing-radiation effects and attributing them to non-ionizing radiation.
How the fear went viral
Worry about wireless radiation predates 5G by decades. The WHO set up its International EMF Project back in 1996 to assess the evidence on radiofrequency fields. In 2011, the International Agency for Research on Cancer (IARC) classified radiofrequency electromagnetic fields as “possibly carcinogenic to humans” — a label we will come back to, because it is one of the most misunderstood facts in this whole debate. A large US animal study, published by the National Toxicology Program in 2018, found increased tumors in rats exposed to high levels of phone radiation, and campaigners seized on it.
But 5G supercharged the anxiety. The rollout began around 2018-2019, and it arrived with visible hardware — new, denser antenna arrays on masts, sometimes mounted at street level — and unfamiliar jargon: beamforming, massive MIMO, millimeter waves. To someone primed to be afraid, it looked like an experiment being conducted on the public without consent. Petitions circulated demanding a moratorium on 5G deployment until more research was done.
Then came the pandemic, and the fear found a story with an ending. According to a study of the episode published in the peer-reviewed literature, the first message linking the COVID-19 outbreak in Wuhan to 5G appeared on Twitter on January 21, 2020: “China is 5G now & working toward 6G. Wireless radiation is an immunosuppressor. Coincidence?” It barely registered. But copies and variants multiplied, and about ten weeks later the arson attacks began — mostly in the UK, but also in Ireland, the Netherlands, Cyprus and New Zealand. Researchers who tracked the episode classified it as a “digital wildfire”: fast-spreading, inaccurate information with serious real-world consequences.
The story had a certain superficial logic. Wuhan was one of the first cities with commercial 5G. People were dying of a mysterious illness. Someone connected the two dots — and then celebrities and television personalities amplified it to audiences of millions. But the dots did not connect. South Korea, the first country to deploy 5G in late 2018, saw its first COVID-19 case arrive from China, imported on a person, not a radio wave. COVID-19 spread ferociously through Iran, India, Indonesia and much of Africa — places with no meaningful 5G presence at all. And the burning of the non-5G mast in Birmingham told its own story about how little the fear had to do with the technology itself.
What the biggest reviews of the evidence found
Strip away the pandemic variant and the question remains: could 5G — or the radio waves used by all mobile generations — be damaging health in subtler ways, like cancer? This is where the WHO’s evidence program is the right place to look, because it has been running systematic reviews specifically to settle it.
A major systematic review commissioned by the WHO as part of its Environmental Health Criteria update examined the evidence on mobile phone use and cancer. Its headline finding: exposure to radiofrequency radiation from mobile phone use likely does not increase the risk of brain cancer — with low certainty in the evidence — and RF from broadcasting antennas or base stations likely does not increase childhood leukaemia risk, with moderate certainty, and may not increase pediatric brain tumor risk. Notably, the review could not assess 5G specifically, because 5G had been around too short a time for direct epidemiological studies to exist. That is an honest limitation — but it also means the scare stories about 5G health effects are claims about a body of evidence that does not exist, not a body of evidence that supports them.
The WHO’s own standing position, repeated over many years of reviews, is blunt: “A large number of studies have been performed over the last two decades to assess whether mobile phones pose a potential health risk. To date, no adverse health effects have been established as being caused by mobile phone use.” On base stations specifically, the WHO has said that “from all evidence accumulated so far, no adverse short- or long-term health effects have been shown to occur from the RF signals produced by base stations,” and that studies give “no indication that environmental exposure to RF fields, such as from base stations, increases the risk of cancer or any other disease.”
Nor is the WHO alone. In 2026, Norway’s Institute of Public Health published an umbrella review of low-level radiofrequency exposure and health, examining tumors, fertility, development, cognition and self-reported symptoms. Its conclusion: no clear health effects had been identified from exposure below the established limits — consistent, it said, with assessments from the WHO, the EU’s scientific committee, the US FDA and health agencies in Canada, Australia, New Zealand, Sweden and the Netherlands. It recommended no lowering of the current exposure limits and no special measures to reduce exposure.
The “possibly carcinogenic” label, explained honestly
The single fact most often cited by 5G alarmists is real: in May 2011, after a week of meetings by 31 scientists from 14 countries, IARC classified radiofrequency electromagnetic fields as “possibly carcinogenic to humans” — Group 2B. It sounds alarming, and it is quoted everywhere as though it settles the question. It does not, and here is why.
IARC’s groups rank the strength of the evidence for a hazard, not the size of the risk. Group 2B is a wide net: it includes pickled vegetables, aloe vera extract and gasoline engine exhaust. Things land in 2B when the evidence is “limited” in humans — which is exactly what the IARC working group concluded about glioma and acoustic neuroma among heavy phone users, while acknowledging that recall bias and inconsistent results might explain the signals. The classification was based largely on the INTERPHONE study, a huge IARC-coordinated effort across 16 study centers in 13 countries — and even INTERPHONE’s own researchers concluded that recall and selection biases and implausible usage reports could explain the elevated risk seen in the heaviest users.
Also worth knowing: population brain-cancer rates have not risen in the decades since mobile phones became universal. If phones — let alone newer, lower-power ones — were causing brain tumors at meaningful rates, epidemiologists would expect to see the incidence curve bend upward. It has not.
The IARC classification is a genuine piece of the scientific record, and it is exactly why agencies keep studying the question rather than declaring it closed. But it is evidence of a question, not an answer — and it predates commercial 5G by eight years.
What people near 5G towers are actually exposed to
This is the part of the debate that rarely makes it into the viral posts, because it is measured in numbers rather than adjectives — and the numbers are humbling for the scare story.
Exposure limits for radio waves are set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), an independent body formally recognized by the WHO. Its 2020 guidelines cover the full range from 100 kHz to 300 GHz — including every frequency 5G uses — and were seven years in the making, with public consultation. ICNIRP’s chairman said at the time that the new guidelines were “more appropriate than the 1998 guidelines for the higher frequencies that will be used for 5G,” adding specific protections for the focused beams that 5G antennas produce and for brief exposures. ICNIRP’s own assessment: “RF EMF exposure below the thermal threshold is unlikely to be associated with adverse health effects.”
So how far below those limits is real-world 5G? The UK regulator Ofcom has been measuring electromagnetic fields around British mobile masts for years, and its 5G-specific program — more than 60 sites across 20 towns and cities — found the highest measured 5G signal at just 0.039 percent of the ICNIRP reference level. That is not a typo: less than four-hundredths of one percent. The largest contribution to the measured levels at those sites came not from 5G but from older generations — 2G, 3G and 4G. Ofcom’s broader audits have never recorded total exposure above about 7 percent of the international reference levels.
A 2025 peer-reviewed study went further, taking spot measurements near 56 active 5G macro base stations across 30 publicly accessible locations in the UK. Even extrapolating to a worst-case scenario, exposure came in at no more than 5 percent of the ICNIRP public reference levels. 4G was the dominant contributor to total RF exposure; 5G contributed on average less than 10 percent. There was no statistically significant difference between beamforming and non-beamforming sites — undercutting one of the specific technical fears.
Device-side, the picture is similar. Data from commercial 5G networks in Australia and South Korea found that median phone transmit power was about 1 percent of the maximum — comparable to 4G phones. Your phone is not blasting your head at full power; it uses the minimum needed to reach the mast.
Then there is the millimeter-wave question — the higher frequencies some 5G networks use, which get the most ominous coverage online. The physics runs the other way from the fear: the higher the frequency, the shallower the penetration into human tissue. Millimeter waves are absorbed in the outer layers of skin. They cannot reach the brain, the heart, or any internal organ. Australia’s radiation safety agency has put the point plainly: 5G initially uses existing mobile frequencies and then moves higher, “where the depth of RF EME penetration into human tissue is short.”
The caveats a fact-check should not hide
No honest account of this topic pretends every scientist agrees or that nothing is unknown. A few things deserve to be stated plainly.
First, the April 2025 WHO-commissioned reviews did produce findings that critics of current safety policy cite with enthusiasm. One review of 52 animal studies rated the evidence for two rare tumors in laboratory animals — heart schwannomas and brain gliomas — as “high certainty.” Another upgraded evidence on male fertility effects to “high certainty.” And a critical response from the International Commission on the Biological Effects of Electromagnetic Fields argued the WHO-commissioned reviews were methodologically flawed and “provide no assurance of safety.” If you only read activist websites, you would think the safety consensus had collapsed.
But the crucial context, which those sites omit, is exposure level. The animal studies used high, whole-body exposures — in some of the long-term bioassays, specific absorption rates up to 6 watts per kilogram — vastly above what any member of the public experiences from a base station or a phone, and the human epidemiological evidence, which is what matters for actual human risk, still points the other way: the WHO-commissioned review of human studies found mobile phone use likely does not increase brain cancer risk. “No evidence of harm” is not the same as “proof of safety,” and good scientists keep the distinction. But the burden for the viral claim — that 5G is dangerous — is positive evidence of danger, and it is not there.
Second, there genuinely are gaps. The EU’s Scientific Committee on Health, Environmental and Emerging Risks has called for more research on the higher frequency bands, including millimeter waves, precisely because 5G is new and the long-term epidemiological record for those bands is thin. IARC’s advisory group has flagged radiofrequency fields as a high-priority candidate for re-evaluation in the 2025–2029 cycle. Ongoing research is not a scandal; it is how the system is supposed to work. Every generation of wireless technology has been studied this way.
Third, individual experiences of symptoms near masts deserve empathy, not mockery. Researchers have studied this carefully — including controlled laboratory trials with randomized exposure — and the evidence consistently shows the symptoms are real to the sufferer but not caused by the fields themselves; people report identical symptoms when the equipment is off and they believe it is on. That finding does not mean the suffering is imaginary. It means the cause is not 5G.
The Verdict
False. The claim that 5G is dangerous to human health is not supported by the evidence.
The World Health Organization, the International Commission on Non-Ionizing Radiation Protection, the UK Health Security Agency, the US Food and Drug Administration, and national health agencies across Europe and Australia all reach the same conclusion: no adverse health effects have been established from mobile phone use, and no adverse health effects have been shown from the radio signals produced by base stations. Real-world measurements near 5G masts record exposures that are small fractions of international safety limits — the highest 5G-specific reading in the UK regulator’s testing was 0.039 percent of the ICNIRP reference level. The coronavirus variant of the claim was fiction; the cancer variant rests on a misreading of a 2011 “possibly carcinogenic” classification that predates 5G and has never been confirmed by the human evidence. Honest uncertainties remain — 5G is young, millimeter-wave research is ongoing — but uncertainty is not danger, and nothing in the evidence as of September 2026 turns it into danger.
What this means for the worried
If you are one of the many people who feel uneasy living near a new mast, the honest summary is this: the unease is understandable — invisible infrastructure installed without your consent would make anyone pause — but the physics and the measurements are both reassuring. Your exposure from the mast down the street is thousands of times below international safety limits, and most of the radio-frequency energy around you comes from older technologies you have lived with for decades, not from 5G.
The practical advice from health authorities is correspondingly boring: there are no special precautions to take, no products to buy, no “radiation shields” that do anything a physics textbook would recognize. The one precaution worth taking is social. The 5G health scare has already done real damage — to burned masts, to connectivity relied on by hospitals, and to the engineers who were abused for doing their jobs. In Birmingham in April 2020, firefighters put out a blaze at a mast that was keeping a hospital connected during a pandemic, because someone believed a story that had no evidence behind it.
That is the truest cost of this claim. It does not make 5G dangerous. It makes the fear of 5G dangerous.
